15 Minutes SMS Door Entry Alarm

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Introduction: 15 Minutes SMS Door Entry Alarm

About: My name is Mostafa I live in Cairo, Egypt and I'm Egyptian, I'm an Engineering Student, Department of Energy and renewable Energy at ASU university, Cairo I'm interested in Technology and DIY projects,pho...

hi guys this is my first instructable i hope you'll enjoy it !!

Got sick of the high prices of Home Security systems ??
have old mobile sets don't know what to do with ?
build a cheap alarm system that will notify you on your mobile by SMS.
ready ??

grab the tools !

Step 1: What You'll Need

An old mobile phone set with supply (charger).
Cheap door magnetic alarm (can be replaced by a magnetic switch and a magnet ).
5 volts Relay.
Soldering iron.
wires and thin insulated copper wires.
micro driller.
micro screwdriver set.
clipper.
multimeter.
Scotch tape.



Step 2: Let's Get to Work

here is the whole thing....you write the text message " for example : the main door was opened " then you put your mobile number then you...don't press the sending button.... you'll make the burglar do it !
you just want the magnetic switch to work as the sending button.

but unfortunately most of the alarms on the market contains an NO "normally-open" magnetic switch
so when the magnetic field applies "that means the door is closed ", the switch closes. and that means also that when the door is opened the magnetic field vanishes and the switch is opened..
we need the opposite of that we need the switch is closed when the door is opened and vise versa

what will we do ?? you can just seek a SPDT "Single Pole Double Throw" magnetic switch from components shops this should solve the problem of the whole alarm, but this was hard to find so i used a relay powered by the mobile charger to do the job..

The other problem is that some mobile sets closes the keypad automatically or switch to standby mode after a period of time "in order to save energy" but most of old ones doesn't... you just have to go to settings and turn of the automatic keypad lock.

if your mobile does closes the keypad automatically or switches to stand buy mode then you'll have to build a small 555 timer circuit that will trigger any unvital key on the keypad like the volume control " every 3 sec for example " to keep it on the send message mode.. of course the mobile should be powered from the charger all the time.


Step 3: Preparing the Mobile Set...

Most of Nokia old mobiles are easy to deal with they don't standby and you can disable the auto keypad lock .
I used nokia 6210 and soldered two wires to the OK button "Upper left":

Step 4: Preparing the Magnetic Alarm...

In this step you'll just solder two wires to the two terminals of the magnetic switch inside.
and drill two holes for the two wires
the batteries in the alarm aren't necessary at all unless you want to keep the noisy alarm

NOTE : you have to test your alarm first, you may not need a relay at all test the magnetic switch with the multimeter to know whether it is NC or NO.

Step 5: Prepairing the Relay and Final Connection

The relay is simply a switch which is turned on or of by an electrical magnet when you apply current on the coil it operates the relay
but the problem is that the relay coil needs power to work , a good idea is to take the DC of the charger
"as the mobile will be always be connected to the charger "



Step 6: Test It Now ....

After checking the wiring and preparing the text your alarm system should be ready
just mount the the magnet on the door and the set on the frame , plug the charger into mains , switch on the mobile open the message and put the mobile number...

of course it's better to mount it in casing or something ...


now it's ready !

waiting for your comments and suggestions : )

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    112 Comments

    Hi there,

    This is an interesting project.

    I have two question to ask you.

    Can a reed switch (NC) be soldered to the speed dial button without the need of a relay?. Here is a link: http://www.maplin.co.uk/p/miniature-magnetic-conta...

    What other phones are possible to soldered, apart from Nokia.

    Thanks!

    Hi, good job, during a month of a period i was tried to find how to make this kind of a thing enabled with sms, thanks a lot for sharing these experiments with all of us. i want to make a employee suggestion box by using this tool, that's why i was search this type of tool. i think it possible to make a SMS alert system when some one drop their suggestions in to the box. if you have any other tools which can help to that, please send it to me. udarathilina.wijerathna@gmail.com, again thank you..

    Hi, good job, during a month of a period i was tried to find how to make this kind of a thing enabled with sms, thanks a lot for sharing these experiments with all of us. i want to make a employee suggestion box by using this tool, that's why i was search this type of tool. i think it possible to make a SMS alert system when some one drop their suggestions in to the box. if you have any other tools which can help to that, please send it to me. udarathilina.wijerathna@gmail.com, again thank you..

    حرامي هههه

    good job ,
    and from where in cairo i can buy this tools

    where did you buy the door magnetic alarm in Cairo ?

    you have done a nice but only nokia phones only suppourt thats only bad luck

    intelligent.. but how sms will send??? it may be that sms will send due to continue press of ok button of Nokia phone... but is it working on other phones??

    can i know what is findings and specific objectives of this device my pleasure to know.

    Men like you, make the world go round! keep going!

    hey i am Egyptian too i am very glad that Egyptian people in instructables

    مشكووووووووووووووووووور اخوي على هل المشروع الاكثر من رائع وانا بحيك من الاردن وان شاء الله للامام ونشوف اشي جديد

    MSA ya Mostafa keep on, and I'm sure that someday you will be a great inventor ;). Bas sa3tha mtt3allish 3alina :DD

    Hi Am I missing something , Once the switch is made , does this not mean that the send button is effectively on all the time. I am thinking of using the system on my old boat , to warn of water ingress , but the switch would make once only , whereas you really want a pulse to operate the phone.
    any ideas.
    Miffy

    4 replies

    Hi,
    No once the message is sent "in most mobiles " it wont be sent again
    you have to "re-trigger" the switch to send the SMS again,
    for your application you can also make a very simple digital circuit to send one pulse and stops working,on this way you wont need to "re-trigger" the system to make it work again.
    cheers

    Hi
    Many thanks will rig up a circuit and try this.

    Hi Miffy,

    I am wondering if you ever got this to work for your old boat. I arrived at the same instructable because I am trying to do the exact same thing to warn me if the bilge pump is running, or if the water level gets too high on my vintage boat.

    Any help you can offer would be great!

    thanks,

    Hi waddellm

    Yes I have had this system working on my boat for the last two years. The only problem I had was keeping the phone battery charged . as I can leave the boat for several months over the winter, All I did was connect the bilge switch do the phone contacts , unfortunatly it was never tested as I have not had a leak.
    Best wishes Andy

    Hi
    Has anyone managed to connect wires to the light or sounder on a phone in order to switch anything on via a phone, any ideas.

    1 reply

    Oooh, Oooh, I know. A BOMB!!!